class_docstr: A TraversableResources based on SimpleReader. Resource providers
  may derive from this class to provide the TraversableResources
  interface by supplying the SimpleReader interface.
code: def files(self):
      return ResourceContainer(self)
  
imports: import abc
  import io
  import itertools
  from typing import BinaryIO, List
  from .abc import Traversable, TraversableResources
label_desc: Use image node_id 1 for calling the TraversableReader obj's underlying member method code with example usage: obj.files() and returns: ResourceContainer